Have anyone added support for ansi-color in compilation-mode Emacs? If so what property/attribute does the color-writing program have to check for in order to make sure its active terminal supports ANSI-escape coloring.
There's already a function for applying color to comint buffers. You simply need to enable it on compilation buffers:
(require 'ansi-color)
(defun colorize-compilation-buffer ()
(toggle-read-only)
(ansi-color-apply-on-region compilation-filter-start (point))
(toggle-read-only))
(add-hook 'compilation-filter-hook 'colorize-compilation-buffer)
Color writing programs should check the TERM
environment variable and the terminfo database to check if the terminal supports color. In practice, a lot of programs ignore this and rely on a user setting. Emacs will set the compilation terminal type to dumb
by default but this can be overriden by setting the compilation-environment
variable.
Update: Note that in Emacs 24.5 the two calls to (toggle-read-only)
in the code above are not needed.
My optimized solution which don't pollute M-x grep
(only for M-x compile
):
(ignore-errors
(require 'ansi-color)
(defun my-colorize-compilation-buffer ()
(when (eq major-mode 'compilation-mode)
(ansi-color-apply-on-region compilation-filter-start (point-max))))
(add-hook 'compilation-filter-hook 'my-colorize-compilation-buffer))
Riffing on @gavenkoa's solution:
(when (require 'ansi-color nil t)
(defun my-colorize-compilation-buffer ()
(when (eq major-mode 'compilation-mode)
(ansi-color-apply-on-region compilation-filter-start (point-max))))
(add-hook 'compilation-filter-hook 'my-colorize-compilation-buffer))
This will not block errors but will still not raise an error if ansi-color is unavailable. Personally, I find the wildcard catch semantics of ignore-error
distasteful.
Riffing on @stribb's solution, which riffs on @gavenkoa's solution, this is how to set it up with the awesome use-package:
(use-package ansi-color
:config
(defun my-colorize-compilation-buffer ()
(when (eq major-mode 'compilation-mode)
(ansi-color-apply-on-region compilation-filter-start (point-max))))
:hook (compilation-filter . my-colorize-compilation-buffer))
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